Fan with folding blades



A. JACCARD AND 1. KOFF- WITH FOLDING BLA ATION HLED MAR.26,

Pimm t.19',1920.

. V ENTORS A, cc w1:

V'by way of example in the n 30 UNITI-:Dl STATES'AT ENT OFFICE ALEXIS JACCARD, @Ps1-CROIX, ,swriiznnrinivn AND Juilrniv Kerr, or.inoivnoisry ENGLAND.

" LFANWITH Femme BLADEs.

To @ZZ whom t may concern: 3 Be it known that we, ALiixis JAccAnD, citizen of Vthe Swiss Confederation,` and residing at St.-Croix, Canton of Vaud, Switzerland, and JULIEN Korn, a citizen of the Russian national-ity, and lresidingat No. v

5, Victoria Arcade, Victoria street, London, b. NQ l, England,vhave invented certain new and useful Improvements in and Relating to F ans with Folding Blades, of which the following is a specification.

This invention consists in improvements in rotary fans of the folding blade type.

The improvements relate more particularly to the manner of actuating the fan blades.

The fan blades are mounted in the usual manner by means of a hub with a friction fit on the shaft of a pinion, and according to the present invention the blades unfold. automatically when the fan is started.

Thefans blades are driven by a toothed wheel actuated by means of al push which is adapted to rock around the shaft on which the fanvblades are mounted, and to drive a crank fixed toa ratchet wheel.

A constructional form of an improved fan of the folding blade type is illustrated accompanying drawings, in which Figure 1 is a rear view of the improved fan after removal of the cover; the push being in its position of rest. K

Fig. 2 is a similar view of the improved fan, but with the push in the position into which it has been moved for the purpose of actuatingthe fan blades. n y

Fig.` 3 is a front view of the improved fan closed with its cover; one of the fan blades being shown unfolded, and the others broken ofi" in part.

Fig. 4 is a side view of when folded.

As shown, a is a back frame plate carry#k ing all the necessary toothedwheels .for ro-` tating the fan blades The fan bladesare Y mounted on va metal hub composed of two plates, the upper one b1 of which has three abutments parallel to the axis of the bore of the hub. kThese abutments are situated"y l2() degrees apart from oneanother'around this axis, and their lengths differ from one another by the thickness'of a fan blade.

The entire combination yof fan blades and hub is mounted with, aV friction ton a moving the push the fan blades i sition by the lpin of the crank. This movement, however,

, be repeated in y revolving.

specicationof Lettesmtent. Ptentedbct, 19, 1920 `Application ined Marches, 192e.A serial No. 368,996.`

conicalv shaft -o carrying va piniony that meshes with the movable members of la` train of toothed wheels terminating in aV wheel d. `This latter wheel carriesfa pawl whichislengaged, vby the actionof a'spring,

ina ratchet wheelya-coaxial to the wheel d and-fixed' to-acrank-.f whose vpin vis engaged i push gadapted to rock place by a bridge iiixed by screws in the rear-.frame plate a. The whole is covered in by a cover z' provided with a finger piece l against which the operator places his lingers and which takes the reaction of the effort exerted by the operator upon the push g in starting the apparatus.

This starting is effected by the operators l by means of his thumband fore-finger.

.The rocking movement of the push g acts upon the-crank in a counterclockwise direction, and this motion is transmitted through the lmedium of the ratchet carried bythe wheel cl, tothe train of toothed wheels, andy thence to the The. fan blades begin their rotation, and if they are in `theirfolded condition, they willunfold automatically by reason of the fact that the air has a ltendency to prevent them from rotating. The fan blades thus Vslide, over one another; 'the first blade remains fixed because it is' held by an abutment 62 of exactly the vwidth of a blade, and a stop b3 that connects the two plates constituting the hub. i

g toward the finger piece,`

pinion c on the shaft offwhich vlatter tne'fan blades are mounted.

The second blade moves back untilit-k` f reaches the second abutment b2@ which has a length equal to the width of twoA fan blades; and the third blade movesback until y it abuts against the ythird abutment b21.

yThe push g is returned into its initial po-`l action of a spring 1 uponA the does not affect the fan blades. These have acquired a certain amounty of kinetic energy which keeps them-moving, while the ratchet of the wheel d merely slips over the 1 i j v when the latter is wheel e y revolving in the .opposite ldirection toV that of the wheel d.

push resumesthe position shown in Fig.

l, and the operation of the parts may order to ykeep the fan blades y i Having now described our invention what We claim as new and desire to secure by Letters Patent is A rotary fan of the folding blade type, comprising in combination a shaft, a hub member on said shaft, comprising a plate provided with abutments Which are parallel to the axis of rotatiomsituated lZO'degrees apart from one another, and Whose respective lengths differ progressively from one another by the thickness of a fan blade, a plurality of blades frietionally held in said hub, and adapted automatically to unfold upon rotation of said shaft, a push member rocking about the shaft, a crank pivotally mounted on said push member, a ratchet Wheel carried by said crank, a train of toothed gearing, a pawl carried by one element of said train and engaging said ratchet Wheel whereby movement of the push member in one direction causes rotation of the shaft through said gearing, and resilient means for returning the push member to normal positionv after the latter has been moved to cause said rotation of the shaft.

In testimony whereof We have signed our names to this specification.

' ALEXIS JACGARD. f JULIEN KOFF. Witness to the signature of Alexis J accard:

N. GoAR. Witness to the signature of Julien Kof:

FRED LoRsrLmN, Jr. 

